Improvement in patterns for metal hubs



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trienio JASPER JOHNSON, OF GENESEO, NEV YORK.

Specification forming part `of Letters Patent No. 9,095, dated July (i, 1852.

To a/ZZ whom it may concern:

Be it known that I, JASPER Jonsson, of Geneseo, in the county of Livingston and State of New York, have invented a new and useful Improvement in the Manufacture of Pipe- Boxes of Metallic Hubs for Carriages, Tagons, &c.; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specication;

Figure l is an exterior view of the hub to which this pipe-box is adapted; Fig. 2, a sectional view; Fig. 3, the parts of the hub detached; Fig. 4, pipe-box as finished; Fig. 6, a sectional view of the improved pattern for casting the pipe-box, exhibiting the shield.

rEhe nature of my invention consists in so forming the pattern for casting pipe-boxes adapted to metallic hubs that the difficulty arising from molding with a solid pattern and dry-sand core, or from molding with a green core formed in a hollow block, is avoided, the one existing in the iirst case requiring care in the formation and adjustment of the dry core to prevent irregularity of thickness, and a joining-line, afterward to ybe removed from the casting; in the other case, or the forming ofthe green core in the hollow block and its after adjustment to the mold in the cope,requires time and care, to say nothing of the liability of breaking the green core at its base from the side surface of the core-box, being so much greater than the diameter of the core.

By my method of dividing the pattern,not, as they are usually done, by a cross-line through their centers, but by slipping one tube on the other, I make the pattern subserve the purpose of forming the green core without the necessity of turning the drag of the dask. My mode rcquires no turning of either part of the flask while molding, and only requires the once lifting the cope to remove the shield or outer portion of the pattern, which, rising with the cope, protects the sand from chipping, as well as securing the core from breaking at its base in the flask, as the remaining portion ofthe pattern is readily removed from the core by lightly tapping and turning the tube on the sand. The metallic hub to which this pipe-box is adapted is represented in the several figures delineated, and which may be described as follows:

Fig. 3 exhibits the parts of the hub as separated, Fig. 4 the pipe-box as finished, Fig. 2 a lsectional view exhibiting all the parts in place, the pipe-box serving as a clamp, and the arm inserted and secured thereto by the heater 7 being inclosed within a flange on the 5 or' the hub.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

Fig. 6 represents a sectional view of the improved pattern-tubc used in molding my pipebox, and although I do not confine myself to any particular proportion, I will describe it as a tube, c' i, rising from an enlarged base, m m. This tube diminishes in diameter toward the end opposite to m m, and forms the hollow in which the green-sand core is compressed in molding. Upon this tube i i is slipped a thin tube, k k, constituting what is termed a shield,77 which is also provided with a base, a n, extending beyond the base m m. When the shield is thus slipped on the tube 1l ,a pattern of the desired size of the pipe-box is obtained.

In the use of this improved pattern inmold ing, the advantage of greater security against breaking the sand, either by chipping in lifting the cope or of breaking across the green core at its junction with the sand base in the drag of the flask, is secured, as the melder is enabled lto draw the pattern by lifting the cope, with which will rise the shield forming a part of the pattern, and which may easily and safely be removed, while the remaining portion of the pattern is left on the sand base in the drag, from which it is removed by slightly tapping and turning on the core formed in the hollow ofthe pattern without risk of breaking the core at its base, which would result if the' pattern were drawn without this tapping and turning from the large side surface ofthe pattern.

In forming a gate at the base or projection m ofthe pattern,the metal rising inthe mold, a perfect pipe-box is formed, of equal thickness of its sides, freedom from joining-line of the mold, and at little cost, as by this improved and divided pattern great facility of molding and perfection of casts are obtained. The only change required in the llask is that the joining pegs or pins should be long enough to secure the accurate rising of the cope in removing it from the drag to draw the shield.

To mold with this improved pattern, place the drag or lower part of the iiask fu. either on a board or on the door of the molding-room. Fill level to the top of the drag s s with sand properly rammed. Then with atrowel form a hollow on the surface sufficiently deep to receive the projecting portion or collar of the pattern, embedding this collar mm level with the surface with sand properly packed, which will retain the tube in a vertical position on the drag ofthe flask. Now fill the hollow of the pattern fi 'i with sand, and thus form a green core united to the sand in the bottom of the drag. If considered necessary, a nail-rod may be introduced through the core into the bottom sand. Make a parting at the top of hollow of the pattern at r, and another at s s. The shield 7c 7a is then slipped on M, thus making the pattern the full size. The upper part of the flask tis then placed on the drag u, observing to have long guide-pins to unite the upper and lower parts of the flask. Fill the part of the ask or cope through which agate/v, is formed.

To draw the pattern, lift the cope, and from the adhesion of the sand on the sides of the shield k k it will cause it to rise with the cope, leaving the tube i i on the green core, thus protecting the sand of the cope from being chipped in separating the flask. rIhe shield is then readily removed fromthe cope by tapping it slightly and giving it a turn by introducing the thumb and fingers in the hollow thereof. The tube i i is slightly tapped and turned on the green core and withdrawn, and thus the mold is formed. Connect the gate formed in the cope with the edge of the projection m or n, return the cope, and it is ready for casting.

Having described my improvement, what I claim as my invention, and desireto secure by Letters Patent, isl I Furnishing the usual pattern with a shield, as herein described, whereby I am enabled more easily to draw the core and prevent chipping and breaking down thereof.

In testimony whereof I have signed my name before two subscribing witnesses.

JASPER JOHNSON. Vitnesses:

J oHN F. CLARK, JOHN L. SMITH. 

